The effects of multiple-injection on exhaust emissions and performance in a small HSDI (High Speed Direct Injection) Diesel engine were examined. The causes for the improvement were investigated using both in-cylinder observation and three-dimensional numerical analysis methods. It is possible to increase the maximum torque, which is limited by the exhaust smoke number, while decreasing the combustion noise under low speed and full load conditions by advancing the timing of the pilot injection. Dividing this early-timed pilot injection into two with a small fuel amount is effective for further decreasing the noise while suppressing the increase in HC emission and fuel consumption. This is realized by the reduced amount of adhered fuel to the cylinder wall. At light loads, the amount of pilot injection fuel must be reduced, and the injection must be timed just prior to the main injection in order to suppress a possible increase in smoke and HC. After-injection, which injects a small amount of fuel immediately after the end of the main injection, reduces smoke, HC and fuel consumption. This is because the jet flame of the after-injection carries the remaining soot of the main injection to the squish area, and then oxidizes that together with the soot which previously existed in the squish area by promoted atmospheric temperature and enhanced mixing with fresh air.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Achieving Lower Exhaust Emissions and Better Performance in an HSDI Diesel Engine with Multiple Injection


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2005 World Congress & Exhibition ; 2005



    Publication date :

    2005-04-11




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Achieving lower exhaust emissions and better performance in an HSDI diesel engine with multiple injection

    Hotta,Y. / Inayoshi,M. / Nakakita,K. et al. | Automotive engineering | 2005


    Optimizing HSDI diesel combustion and emissions using multiple injection strategies

    Liu,Y. / Reitz,R.D. / Univ.of Wisconsin-Madison,US | Automotive engineering | 2005



    Optimizing the multiple injection settings on an HSDI diesel engine

    Ricaud, J. C. / Lavoisier, F. / Institution of Mechanical Engineers (Great Britain) | British Library Conference Proceedings


    Fuel Injection Technology for Low Emissions HSDI Diesel Engines

    Gill, Denis W. / Herzog, Peter L. | SAE Technical Papers | 1996